Stephen, Leslie, 1832-1904
University Paperbacks, 1963
Buku Teks
Trevelyan, George Macaulay, 1876-1962
Longmans, Green, 1951
Buku Teks
Thomson, Thomas
Cambridge University Press, 2012
eBooks
Mathias, Peter
Methuen , 1979
Buku Teks
Malhotra, Karamjit K.
Oxford University Press, 2016
eBooks